if it will boost the local economy. then there's the final economic reasons, physicists like molecular physicist have turned their attention to cities of theoretical exercises and said what type causes of our product give a what product cavite and the ones who've gone as far as it are convinced technically but we all know when her heart, which is the reason cities exist as when we come together, were more days. if tantalizingly difficult to prove that it's the strength of cities and not make sense economically stronger. but glaser talks about that a lot. david brooks talks about how when someone gets a patent, there required to say orestes heywood at the pet that influence to? almost always within 25 miles of the patent here. malcolm gladwell talks about the french impressionist old friends who hung out in the same buyer. they all trained the same absinthe. you know, movements are collected and made by people in proximity. people talk about if you're in a european capital come you can get five minutes done in a day. if